Needing answers

Okay I had my period in February, but missed my March period. Ever since getting off of Birth control, my periods have been irregular. I've been TTC since December. Well I took a pregnancy test after not starting and another two days later. Both negative. However, my boobs have been sore, my back hurting, I get cramping on a daily basis but not period cramps. Also, my thyroid is acting up. It's acted up before, but I've never felt like this. Does anyone else have thyroid problems and TTC? I don't know too much about thyroid issues, I just know my body isn't producing the hormone correctly.